Boiler construction



Jan. 9, 1934. c. N. LAWLESS ET AL BOILER CONSTRUCTION Filed May 31, 1932 2 Sheets-Sheet 1 INVENTORS BY Mal/4' .34 War WOOD,

VIN E N R O T T A Jan. 9, 1934. c. N. LAWLESS El AL BOILER CONSTRUCTION Filed May 31, 1952 2 Sheets-Sheet 2 INVENTOR5. awe/w n. Mwuss w 101/4 mamwap BY ATTORNEY.

Patented Jan. 9, 1934 UNITED STATES F1 on BOILER CONSTRUCTION Application May 31, 1932. Serial No. 614,416

5 Claims.

Our invention relates to a new and useful improvement in a boiler construction adapted for use in heating purposes in the heating of buildings, dwellings, and the like.

It is an object of the present invention to provide a heating boiler of this class which will be simple of structure, economical of manufacture, durable, easily and quickly assembled compact so as to occupy a minimum of space, and one which will afford an easy and quick means of cleaning the same.

- Another object of the present invention is the provision of a heating boiler of this class in which the water circulation will be raised to a maximum efliciency.

Another object of the invention is the provision of a boiler of this class in which a minimum amount of water may be used and in which a very rapid generation of steam may be eiiected.

Another object of the invention is the provision of a boiler construction of this class in which the maximum of heating efiiciency will be obtained and in which a minimum amount of fuel may be used.

Another object of the invention is the provision of a pair of superimposed water containing drums in communication with each other, and so arranged and constructed that the heat used in the device will be transmitted to one side only of the boiler, thus assuring a proper circulation between the drums which are connected in communication with each other at both sides.

Another object of the invention is the provision of water tubes which are heated and so arranged and constructed. and mounted in a combustion chamber as to assure a maximum heating of the same, and reduce to a minimum the stack temperature.

Other objects will appear hereinafter.

The invention comprises the combination and arrangement of parts hereinafter described and claimed.

The invention will be best understood by a reference to the accompanying drawings which iorma part of this specification, and in which,

Fig. 1 is a transverse, vertical, sectional view of the invention.

Fig. 2 is a longitudinal, vertical, sectional view of the invention.

Fig. 3 is a fragmentary view of the economizer shown in perspective.

Fig. 4 is a View taken on line 44 of Fig. 1.

Fig. 5 is a fragmentary sectional View through one of the heating tubes illustrating its connection with the drum.

Fig. 6 is a fragmentary sectional view through one of the ends of the drums.

Fig. '7 is a fragmentary sectional view taken on line 7-7 of Fig. 1.

In the invention we provide a housing or casing 60. which may be suitably ornamented so as to be attractive and ornamental in appearance. This housing or casing comprises the side walls 9 and 10, the rear wall 11, the top 12 and a front wall consisting of the sections 13, 14, and 15. In the section 15, above the bottom 1'7 is provided a door 16 so that access may be had to the burner 31 which may be either a gas burner, an oil burner or the like. Mounted in the upper-part of the casing is a drum 18 supported by the strap 19 7o connected to the angle irons 20 and 21 which are mounted on the side walls 10 and 9 respectively.

Circulation pipes 22 serve to connect the drum 18 in communication with the drum 23 which is suuported on the straps 24 connected to the angle irons 25 and 26. Projecting upwardly from the base or bottom 1'7 at an incline to the vertical is a metallic plate 27 terminating in'the angularly turned, substantially horizontally disposed portion 28. A facing 29 of insulating material so is mounted on a plate 27 and a similar facing or plate 30 is mounted on the angularly turned por tion 28. This construction affords a bridge'wall or bafile positioned above the burner 31, and it will be noted that the end of the bridge wall or baflie extends beyond the drum 23 so that the heat is deflected outwardly from the bottom of the drum. Heating tubes 32 which are considerably smaller than the communicating tubes 22 and which are preferably formed from copper and more numerous than the tubes 22 serve to connect the drums 23 and 18 in communication. It will be noted that the heating tubes 32 connect these drums in communication at one side, while the tubes 22 connect the drums in communication at the opposite side. These heating tubes 32 are crowded together or banked closely intermediate their ends as at 33. A sinuous metallic plate 34'extends vertically Within the casing and is provided with a facing 35 of heat insulating material which cooperates with the heat insulating layer 37 mounted on the sinuous support 36 to form a combustion chamber 38 in which the heating tubes 32 are positioned. These sinuous parts also serve as bafiles so that the combustion chamber is of sinuous formation with the re sult that the gases are caused to travel a maximum distance, and thus there is a maximum heating surface provided in the heating tubes 32. This combustion chamber 38 communicates the drums.

with the outlet flue 39. A bafiie is mounted in the drum 18 to prevent surging of the water. A steam pipe 41 communicates with the upper end of the drum 18 above the normal water level so as to conduct steam through the super-heater 42 and to the point of use.

A pipe 43 which communicates with the radiator or other object with which the steam is used serves as a condensate return pipe to return the condensation to the interior of the economizer 44. This economizer 44 is doubled over upon itself at its upper edge as at 45 to provide a structure J -shaped in cross section. The pipe 46 communicates wth the doubled over portion and also communicates with the drum 23. A feed pipe 47 is illustrated as in communication with the drum 23.

Each of the drums is provided with an end wall 48 having on its inner face a rib 49 adapted for engaging in the groove 50 formed in the cylindrical portion 51 of the drum. This cylindrical portion 51 carries the threaded stud 52 which projects through an opening formed in the end wall 48 and on which is threaded the nut 53. A plurality of these studs 52 are provided for each of the end walls and there is thus afforded an easy and quick method of attaching the end walls to the' cylindrical portion of the drum so that a tightly sealed connection is thus afforded at the end walls and a construction provided which permits of an easy and quick cleaning of the drums.

In Fig. 5 we have illustrated the method of connecting the ends of the heating tubes 32 with Since these tubes: are formed from copper they may be easily and quickly expanded and to this end we connect the ends of the tubes 52 to openings 55 formed in the drums. These ends are then expanded as at 54 by an expanding ring 56 which is driven into the ends. In this way a tight sealing of the heating tubes with the drums is effected, and a construction is provided for permitting of ready removal and replacement of the tubes.

Spaced inwardly from the rear wall 11 is the vertically extending supporting plate 57 carrying the facing of heat insulating material 58 which is positioned inwardly and toward the heating tubes 32. The forward side of the combustion chamber is sealed by sections of insulating material supported on a suitable back. The lower section is provided with the metallic plate 59 carrying the facing 60 of heat insulating material. The upper sections 61, 62 and 63 are similarly constructed. These sections are all held together in the same manner. In Fig. '7 this method of attaching the section of insulating material is illustrated. Studs 64 project outwardly from the supports 34 and 36 and project through openings formed in the sections. In Fig. '7 the section 61 is indicated with the stud projected therethrough. Threaded on the stud 64 is a nut 65. This construction is such that an easy and quick removal of these insulating sections becomes possible. When it is desired to clean the heating tubes 32, it is but necessary to remove the sections 13, 14 and 15 which form the front wall of the casing or housing whereby the insulating sections may be removed and the tubes 32 and 22 are easily cleaned by a spraying of non-combustible material. A water gauge 66 and a relief valve 67 is illustrated mounted on the device in the usual manner. The insulating support 34 is retained in position by suitable brackets 67.

It will be noted that the heat from the burner 31 is concentrated on the heating tubes 32 and that one side of the drum 33 is heated considerably more than the other side. This is also true of the drum 18 and the cooler side of these drums are in communication with each other through the large pipe 22 which serves as a water circulating pipe. Due to this construction and this method of heating a free and rapid circulation of the water is effected so that a maximum efficiency of the device is provided. Because of the banking of the tubes in the manner indicated, the formation of the tubes from copper and the heating of the drums in this manner, a small amount of Water may be used so that the device is effective for a quick generation of steam. This results in an econocmy of fuel consumption due partly to the heat interference, and partly to the fact that the generation of the steam responds quickly to the application of the heat, and to the large heating surface of the tubes 32. The device is also, on account of its structure, a compact arrangement, thus requiring a minimum amount of space and affording a structure which may be made very attractive and ornamental in appearance.

While we have illustrated and described the preferred form of our construction, we do not wish to limit ourselves to the precise details of structure shown, but desire to avail ourselves of such variations and modifications as may come Within the scope of the appended claims.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is:

l. A boiler construction of the class described comprising: a pair of superimposed drums, in spaced relation to each other; a combustion chamber, a portion of each of said drums being exposed in said combustion chamber; tubes exterior of said combustion chamber connecting said drums in communication with each other; a plu- 1'15 rality of tubes within said combustion chamber establishing communication of said drums with each other, said last mentioned tubes being formed sinuous between their ends; and a sinuous bafile formation embracing said last mentioned tubes.

2. A boiler construction of the class described comprising: a pair of drums in superimposed spaced relation; a combustion chamber, one side of each of said drums being exposed in said combustion chamber; means exterior of said combustion chamber for establishing communication of said drums with each other for permitting circulation of water between said drums; a plurality of heating tubes within said combustion chamber and establishing communication between said drums, said heating tubes being formed sinuous intermediate their ends; a sinuous baffle formation arranged about said heating tubes; and a heating element below the lower of said drums.

3. A boiler construction of the class described comprising: a pair of drums in superimposed spaced relation; a combustion chamber, one side of each of said drums being exposed in said combustion chamber; a sinuous wall formation de- 149 termining said combustion chamber; a plurality of heating tubes within said combustion chamber establishing communication between the exposed sides of said drums and formed sinuous intermediate their ends to conform with the sinuosity of said wall construction; and water circulating tubes exterior of said combustion chamber connecting said drums in communication with each other.

4. In a boiler construction of the class de- 150 5. In a boiler construction of the class described: a pair of spaced drums; a combustion chamber extending between said drums, a portion of each of said drums being exposed in said combustion chamber; a plurality of tubes within said combustion chamber establishing communication between said drums, said tubes being formed sinuous between their ends; and a sinuous baffie formation in said combustion chamber conforming in curvature to the curvature of said tubes.

CHARLES N. LAWLESS. JOHN BLACKWOOD. 

